cc: Merge LayerTree into the LayerTreeHost.

cc/trees/tree_synchronizer.cc

Index: cc/trees/tree_synchronizer.cc
diff --git a/cc/trees/tree_synchronizer.cc b/cc/trees/tree_synchronizer.cc
index 3f467e04ad6b50dc20074aa34aa3ce54ea23ed7f..b593a9d66e9e6982baaef07fab91cbf1a0976e82 100644
--- a/cc/trees/tree_synchronizer.cc
+++ b/cc/trees/tree_synchronizer.cc
@@ -13,7 +13,6 @@
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_impl.h"
-#include "cc/trees/layer_tree.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_impl.h"
 
@@ -46,8 +45,8 @@ void TreeSynchronizer::SynchronizeTrees(Layer* layer_root,
   if (!layer_root) {
     tree_impl->DetachLayers();
   } else {
-    SynchronizeTreesInternal(layer_root->GetLayerTree(), tree_impl,
-                             layer_root->GetLayerTree()->property_trees());
+    SynchronizeTreesInternal(layer_root->layer_tree_host(), tree_impl,
+                             layer_root->layer_tree_host()->property_trees());
   }
 }
 
@@ -105,7 +104,7 @@ void TreeSynchronizer::PushLayerProperties(LayerTreeImpl* pending_tree,
                               active_tree);
 }
 
-void TreeSynchronizer::PushLayerProperties(LayerTree* host_tree,
+void TreeSynchronizer::PushLayerProperties(LayerTreeHost* host_tree,
                                            LayerTreeImpl* impl_tree) {
   PushLayerPropertiesInternal(host_tree->LayersThatShouldPushProperties(),
                               impl_tree);